Prevent guest views from issuing a search for empty text.

content/public/browser/web_contents.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 624 matching lines @@
                             uint32_t max_bitmap_size,
                             bool bypass_cache,
                             const ImageDownloadCallback& callback) = 0;
 
   // Returns true if the WebContents is responsible for displaying a subframe
   // in a different process from its parent page.
   // TODO: this doesn't really belong here. With site isolation, this should be
   // removed since we can then embed iframes in different processes.
   virtual bool IsSubframe() const = 0;
 
-  // Finds text on a page.
+  // Finds text on a page. |search_text| should not be empty.
   virtual void Find(int request_id,
                     const base::string16& search_text,
                     const blink::WebFindOptions& options) = 0;
 
   // Notifies the renderer that the user has closed the FindInPage window
   // (and what action to take regarding the selection).
   virtual void StopFinding(StopFindAction action) = 0;
 
   // Requests the renderer to insert CSS into the main frame's document.
   virtual void InsertCSS(const std::string& css) = 0;
@@ skipping 38 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_